Update python-package-conda.yml

Author: nlsschim

.github/workflows/python-package-conda.yml

@@ -54,6 +54,7 @@ jobs:
 
     - name: Lint with flake8
       run: |
+        conda install flake8
         # stop the build if there are Python syntax errors or undefined names
         flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
         # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide